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A218871 as a simple table

na(n)
20
32
44
512
620
752
8100
9214
10414
11876
121722
133524
146992
1514144
1628188
1756720
18113180
19227084
20453748
21908804
221816726
233636336
247270770
2514547228
2629090912
2758192994
28116378984
29232780848
30465546796
31931139720
321862251212
333724592874
347449128940
3514898442336
3629796768552

[0,2,4,12,20,52,100,214,414,876,1722,3524,6992,
 14144,28188,56720,113180,227084,453748,908804,
 1816726,3636336,7270770,14547228,29090912,
 58192994,116378984,232780848,465546796,931139720,
 1862251212,3724592874,7449128940,14898442336,
 29796768552]